<?php
-
/**
+ * DjVu image handler
*
- * Copyright (C) 2006 Brion Vibber <brion@pobox.com>
+ * Copyright © 2006 Brion Vibber <brion@pobox.com>
* http://www.mediawiki.org/
*
* This program is free software; you can redistribute it and/or modify
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
+ * @file
*/
/**
*
* File format docs are available in source package for DjVuLibre:
* http://djvulibre.djvuzone.org/
+ *
+ * @ingroup Media
*/
class DjVuImage {
function __construct( $filename ) {
$this->mFilename = $filename;
}
-
+
/**
* Check if the given file is indeed a valid DjVu image file
* @return bool
$info = $this->getInfo();
return $info !== false;
}
-
-
+
+
/**
* Return data in the style of getimagesize()
* @return array or false on failure
*/
public function getImageSize() {
$data = $this->getInfo();
-
+
if( $data !== false ) {
$width = $data['width'];
$height = $data['height'];
-
+
return array( $width, $height, 'DjVu',
"width=\"$width\" height=\"$height\"" );
}
return false;
}
-
+
// ---------
-
+
/**
* For debugging; dump the IFF chunk structure
*/
function dump() {
$file = fopen( $this->mFilename, 'rb' );
$header = fread( $file, 12 );
- // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
+ // @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
extract( unpack( 'a4magic/a4chunk/NchunkLength', $header ) );
echo "$chunk $chunkLength\n";
$this->dumpForm( $file, $chunkLength, 1 );
fclose( $file );
}
-
+
private function dumpForm( $file, $length, $indent ) {
$start = ftell( $file );
$secondary = fread( $file, 4 );
if( $chunkHeader == '' ) {
break;
}
- // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
+ // @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
extract( unpack( 'a4chunk/NchunkLength', $chunkHeader ) );
echo str_repeat( ' ', $indent * 4 ) . "$chunk $chunkLength\n";
-
+
if( $chunk == 'FORM' ) {
$this->dumpForm( $file, $chunkLength, $indent + 1 );
} else {
}
}
}
-
+
function getInfo() {
+ wfSuppressWarnings();
$file = fopen( $this->mFilename, 'rb' );
+ wfRestoreWarnings();
if( $file === false ) {
wfDebug( __METHOD__ . ": missing or failed file read\n" );
return false;
}
-
+
$header = fread( $file, 16 );
$info = false;
-
+
if( strlen( $header ) < 16 ) {
wfDebug( __METHOD__ . ": too short file header\n" );
} else {
- // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
+ // @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
extract( unpack( 'a4magic/a4form/NformLength/a4subtype', $header ) );
-
+
if( $magic != 'AT&T' ) {
wfDebug( __METHOD__ . ": not a DjVu file\n" );
} elseif( $subtype == 'DJVU' ) {
fclose( $file );
return $info;
}
-
+
private function readChunk( $file ) {
$header = fread( $file, 8 );
if( strlen( $header ) < 8 ) {
return array( false, 0 );
} else {
- // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
+ // @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
extract( unpack( 'a4chunk/Nlength', $header ) );
return array( $chunk, $length );
}
}
-
+
private function skipChunk( $file, $chunkLength ) {
fseek( $file, $chunkLength, SEEK_CUR );
-
+
if( $chunkLength & 0x01 == 1 && !feof( $file ) ) {
// padding byte
fseek( $file, 1, SEEK_CUR );
}
}
-
+
private function getMultiPageInfo( $file, $formLength ) {
// For now, we'll just look for the first page in the file
// and report its information, hoping others are the same size.
if( !$chunk ) {
break;
}
-
+
if( $chunk == 'FORM' ) {
$subtype = fread( $file, 4 );
if( $subtype == 'DJVU' ) {
$this->skipChunk( $file, $length );
}
} while( $length != 0 && !feof( $file ) && ftell( $file ) - $start < $formLength );
-
+
wfDebug( __METHOD__ . ": multi-page DJVU file contained no pages\n" );
return false;
}
-
+
private function getPageInfo( $file, $formLength ) {
list( $chunk, $length ) = $this->readChunk( $file );
if( $chunk != 'INFO' ) {
wfDebug( __METHOD__ . ": expected INFO chunk, got '$chunk'\n" );
return false;
}
-
+
if( $length < 9 ) {
wfDebug( __METHOD__ . ": INFO should be 9 or 10 bytes, found $length\n" );
return false;
wfDebug( __METHOD__ . ": INFO chunk cut off\n" );
return false;
}
-
- // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
+
+ // @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
extract( unpack(
'nwidth/' .
'nheight/' .
'vresolution/' .
'Cgamma', $data ) );
# Newer files have rotation info in byte 10, but we don't use it yet.
-
+
return array(
'width' => $width,
'height' => $height,
* @return string
*/
function retrieveMetaData() {
- global $wgDjvuToXML;
- if ( isset( $wgDjvuToXML ) ) {
- $cmd = $wgDjvuToXML . ' --without-anno --without-text ' .
+ global $wgDjvuToXML, $wgDjvuDump, $wgDjvuTxt;
+ wfProfileIn( __METHOD__ );
+
+ if ( isset( $wgDjvuDump ) ) {
+ # djvudump is faster as of version 3.5
+ # http://sourceforge.net/tracker/index.php?func=detail&aid=1704049&group_id=32953&atid=406583
+ wfProfileIn( 'djvudump' );
+ $cmd = wfEscapeShellArg( $wgDjvuDump ) . ' ' . wfEscapeShellArg( $this->mFilename );
+ $dump = wfShellExec( $cmd );
+ $xml = $this->convertDumpToXML( $dump );
+ wfProfileOut( 'djvudump' );
+ } elseif ( isset( $wgDjvuToXML ) ) {
+ wfProfileIn( 'djvutoxml' );
+ $cmd = wfEscapeShellArg( $wgDjvuToXML ) . ' --without-anno --without-text ' .
wfEscapeShellArg( $this->mFilename );
$xml = wfShellExec( $cmd );
+ wfProfileOut( 'djvutoxml' );
} else {
$xml = null;
}
+ # Text layer
+ if ( isset( $wgDjvuTxt ) ) {
+ wfProfileIn( 'djvutxt' );
+ $cmd = wfEscapeShellArg( $wgDjvuTxt ) . ' --detail=page ' . wfEscapeShellArg( $this->mFilename ) ;
+ wfDebug( __METHOD__.": $cmd\n" );
+ $retval = '';
+ $txt = wfShellExec( $cmd, $retval );
+ wfProfileOut( 'djvutxt' );
+ if( $retval == 0) {
+ # Strip some control characters
+ $txt = preg_replace( "/[\013\035\037]/", "", $txt );
+ $reg = <<<EOR
+ /\(page\s[\d-]*\s[\d-]*\s[\d-]*\s[\d-]*\s*"
+ ((?> # Text to match is composed of atoms of either:
+ \\\\. # - any escaped character
+ | # - any character different from " and \
+ [^"\\\\]+
+ )*?)
+ "\s*\)
+ | # Or page can be empty ; in this case, djvutxt dumps ()
+ \(\s*()\)/sx
+EOR;
+ $txt = preg_replace_callback( $reg, array( $this, 'pageTextCallback' ), $txt );
+ $txt = "<DjVuTxt>\n<HEAD></HEAD>\n<BODY>\n" . $txt . "</BODY>\n</DjVuTxt>\n";
+ $xml = preg_replace( "/<DjVuXML>/", "<mw-djvu><DjVuXML>", $xml, 1 );
+ $xml = $xml . $txt. '</mw-djvu>' ;
+ }
+ }
+ wfProfileOut( __METHOD__ );
+ return $xml;
+ }
+
+ function pageTextCallback( $matches ) {
+ # Get rid of invalid UTF-8, strip control characters
+ return '<PAGE value="' . htmlspecialchars( UtfNormal::cleanUp( $matches[1] ) ) . '" />';
+ }
+
+ /**
+ * Hack to temporarily work around djvutoxml bug
+ */
+ function convertDumpToXML( $dump ) {
+ if ( strval( $dump ) == '' ) {
+ return false;
+ }
+
+ $xml = <<<EOT
+<?xml version="1.0" ?>
+<!DOCTYPE DjVuXML PUBLIC "-//W3C//DTD DjVuXML 1.1//EN" "pubtext/DjVuXML-s.dtd">
+<DjVuXML>
+<HEAD></HEAD>
+<BODY>
+EOT;
+
+ $dump = str_replace( "\r", '', $dump );
+ $line = strtok( $dump, "\n" );
+ $m = false;
+ $good = false;
+ if ( preg_match( '/^( *)FORM:DJVU/', $line, $m ) ) {
+ # Single-page
+ if ( $this->parseFormDjvu( $line, $xml ) ) {
+ $good = true;
+ } else {
+ return false;
+ }
+ } elseif ( preg_match( '/^( *)FORM:DJVM/', $line, $m ) ) {
+ # Multi-page
+ $parentLevel = strlen( $m[1] );
+ # Find DIRM
+ $line = strtok( "\n" );
+ while ( $line !== false ) {
+ $childLevel = strspn( $line, ' ' );
+ if ( $childLevel <= $parentLevel ) {
+ # End of chunk
+ break;
+ }
+
+ if ( preg_match( '/^ *DIRM.*indirect/', $line ) ) {
+ wfDebug( "Indirect multi-page DjVu document, bad for server!\n" );
+ return false;
+ }
+ if ( preg_match( '/^ *FORM:DJVU/', $line ) ) {
+ # Found page
+ if ( $this->parseFormDjvu( $line, $xml ) ) {
+ $good = true;
+ } else {
+ return false;
+ }
+ }
+ $line = strtok( "\n" );
+ }
+ }
+ if ( !$good ) {
+ return false;
+ }
+
+ $xml .= "</BODY>\n</DjVuXML>\n";
return $xml;
}
-
-}
+ function parseFormDjvu( $line, &$xml ) {
+ $parentLevel = strspn( $line, ' ' );
+ $line = strtok( "\n" );
-?>
+ # Find INFO
+ while ( $line !== false ) {
+ $childLevel = strspn( $line, ' ' );
+ if ( $childLevel <= $parentLevel ) {
+ # End of chunk
+ break;
+ }
+
+ if ( preg_match( '/^ *INFO *\[\d*\] *DjVu *(\d+)x(\d+), *\w*, *(\d+) *dpi, *gamma=([0-9.-]+)/', $line, $m ) ) {
+ $xml .= Xml::tags( 'OBJECT',
+ array(
+ #'data' => '',
+ #'type' => 'image/x.djvu',
+ 'height' => $m[2],
+ 'width' => $m[1],
+ #'usemap' => '',
+ ),
+ "\n" .
+ Xml::element( 'PARAM', array( 'name' => 'DPI', 'value' => $m[3] ) ) . "\n" .
+ Xml::element( 'PARAM', array( 'name' => 'GAMMA', 'value' => $m[4] ) ) . "\n"
+ ) . "\n";
+ return true;
+ }
+ $line = strtok( "\n" );
+ }
+ # Not found
+ return false;
+ }
+}
dépôts / lhc / web / wiklou.git / blobdiff